First-Order Localized-Electron<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>⇆</mml:mi></mml:math>Collective-Electron Transition in LaCo<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">O</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>

Raccah, P. M.; Goodenough, John B

doi:10.1103/physrev.155.932

Cited by 906 publications

(539 citation statements)

References 13 publications

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“…The Co 3+ spin states may be (a) low-spin (LS) (t2g 6 eg 0 ), (b) intermediate-spin (IS) (t2g 5 eg 1 ), or (c) high-spin (HS) (t2g 4 eg 2 ) [10][11][12]. The competition between different spin states has caused large controversy in the literature previously [10,[12][13][14][15][16][17][18][19], but in most studies only the case of LaCoO3 has been considered. Different studies favor either a LS to IS or a LS to HS state transition by heating across Ts1 ≈ 75 K [20][21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Microwave-Assisted Synthesis, Microstructure, and Magnetic Properties of Rare-Earth Cobaltites

et al. 2016

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Citation for published item:quti¡ errez eij sD tuli nd r doEqonj lD tes¡ us nd ¡ evil fr ndeD h vid nd erryD s n nd wor¡ nD imilio nd hmidtD iner @PHIUA 9wi row veE ssisted synthesisD mi rostru tureD nd m gneti properties of r reEe rth o ltitesF9D snorg ni hemistryFD ST @IAF ppF TPUETQQF Further information on publisher's website:This document is the Accepted Manuscript version of a Published Work that appeared in nal form in Inorganic Chemistry, copyright c 2016 American Chemical Society after peer review and technical editing by the publisher. To access the nal edited and published work see https://doi.org/10.1021/acs.inorgchem.6b02557. Additional information:Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-pro t purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. AbstractThe series of perovskite rare-earth (RE) doped cobaltites (RE)CoO3 (RE = La -Dy) was prepared by microwave-assisted synthesis. The crystal structure undergoes a change of symmetry depending on the size of the RE cation. LaCoO3 is rhombohedral, S.G. , while for the rest of the RE series (Pr -Dy) the symmetry is orthorhombic, S.G. Pnma (No. 62). The crystal structure obtained by X-Ray diffraction was confirmed by high resolution transmission electron microscopy, which yielded a good match between experimental and simulated images. It is further shown that the well-known magnetism in LaCoO3, which involves a thermally induced Co 3+ (d 6 ) low spin to intermediate or high spin state transition, is strongly modified by RE-doping and a rich variety of magnetic order has been detected across the series.

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Section: Introductionmentioning

confidence: 99%

Microwave-Assisted Synthesis, Microstructure, and Magnetic Properties of Rare-Earth Cobaltites

et al. 2016

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“…The ground state is insulating and nonmagnetic (NM) with Co 3+ in the LS state. LCO undergoes a crossover to a paramagnetic insulating phase at about 100 K, and a metal-insulator transition above 500 K [17]. However, the spin structure at different temperatures has been highly debated.…”

Section: Introductionmentioning

confidence: 99%

“…However, the spin structure at different temperatures has been highly debated. For example, the LS-HS [17,18], LS-IS [19,20], and LS-HS/LS crossover scenarios have been discussed in the literature [21][22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Strain-driven spin-state transition and superexchange interaction in LaCoO3:Abinitiostudy

2012

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Using spin density functional theory with the Hubbard correction we investigate the magnetic structure of strained LaCoO 3 . We show that beyond biaxial tensile strain of 2.5%, local magnetic moments originating from the high spin (HS) state of Co 3+ emerge in a low spin (LS) Co 3+ matrix. In contrast, we find that compressive strain is not able to stabilize a magnetic state due to geometric constraints. LaCoO 3 accommodates tensile strain via spin state disproportionation resulting in an unusual sublattice structure. In tensile-strained LaCoO 3 , the first nearest neighbor (n.n.) exchange coupling is ferromagnetic (FM) while the second n.n. interaction is stronger and antiferromagnetic (AFM). This unusual feature of the exchange parameters is qualitatively verified with a model superexchange calculation. Due to the competition between the FM and AFM couplings in the system, we find that the most probable magnetic structure of tensile-strained LCO is a canted-spin structure, which may explain the relatively small observed magnetic moment of 0.7μ B /Co 3+ .

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“…According to this band model, lanthanide cobaltate should be a poor conductor at low temperature, because low spin Co^^^ (^Z^g^g^) more stable than high spin Co^* 4 2 (tg gBg). The resistivity of LaCoO^ has been reported to be higher than 1 X 10^ n-cm at 4.2°K [51] in agreement with this prediction. As the temperature increases, the splitting energy between e^ and tgg is lower, the concentration of high spin Co^* increases, and the resistivity of the cobaltate decreases.…”

Section: Doped Zno-defects and Electrical Characteristicssupporting

confidence: 80%

“…The resistivity of LaCoOg was reported to be around 1 0-cm at room temperature, and at higher temperatures, 125 < T < 650°C for LaCoOg, the resistivity decreases much more rapidly, and goes through a broad maximum at 650 < T < 937°C, which indicates that most Co^^^ has been converted to Co^* above 650°C. Above 937°C, where the material undergoes a transition from a rhombohedral structure to a pseudocubic structure, LaCoO^ shows metallic behavior (p ~ 10"^ 0-cm) [51]. The resistivity of the analogous material PrCoO^ has been reported to be around 10 0-cm at room temperature, and the material has been observed to undergo a semiconductor-metal transition upon heating like that of LaCoO^ [52].…”

Section: Doped Zno-defects and Electrical Characteristicsmentioning

confidence: 96%

Electrical switching of some zinc oxide based ceramics

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First-Order Localized-Electron⇆Collective-Electron Transition in LaCoO3

Cited by 906 publications

References 13 publications

Microwave-Assisted Synthesis, Microstructure, and Magnetic Properties of Rare-Earth Cobaltites

Microwave-Assisted Synthesis, Microstructure, and Magnetic Properties of Rare-Earth Cobaltites

Strain-driven spin-state transition and superexchange interaction in LaCoO3:Abinitiostudy

Electrical switching of some zinc oxide based ceramics

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